» » »

Pontiac Q&A

Ask Your Question

2004 Pontiac Montana Question: Anyone know the source of an intermittant raw gas smell in my Pontiac Montana?

 

Question

Rookie2, 3.4L V6, New Haven, IN, February 28, 2012, 15:08
 Rookie

Only smell gas when engine is running or right after shutoff. Pulled vacuum hose thinking it was fuel pressure regulator but couldn't detect gas. Doesn't happen every day. No hard start or drivability problems. No leaks detected on the floor but the gas smell seems stronger at the engine.

2 Answers
Flag This
  • Answer #1

    February 28, 2012, 15:20
    Profile_thumbnail
     Master

    May not be a gas leak but a combination of 2 things. Poor combustion due to worn out spark plugs or a bad spark plug coil and an exhaust leak between the catalytic converter and the main exhaust manifolds. Have to check both to see if the flex pipe is bad or the spark plugs are as well. Exhaust has a much stronger gas smell before it goes through the catalytic converter.

    Flag This
  • Reply

    Rookie2, February 28, 2012, 15:41
     Rookie

    Thanks for the information. The spark plugs are new. Could be the coil. I will also check out the exhaust leak. I still don't understand why the problem is intermittant.

    Flag This
  • Reply

    Cris40, May 08, 2013, 08:32
     Rookie

    Did you figure out the problem and find a fix? I've had my Montana in 3 times for this issue and they can't figure it out.

    Flag This
  • Reply

    Mud_Shark, June 26, 2013, 07:38
     Rookie

    We have been chasing this problem for the past couple years. this is our 3rd time in today - but in the previous 2 attempts - no improvement. It comes and goes, and like a gremlin, usually isn't smelling bad on the day I bring it in to the shop. With the intermittent nature of the problem, I wonder if it isn't due to some computer malfunction.

    Flag This
  • Reply

    volvoturbo, December 03, 2013, 05:29
     Rookie

    MINE was the injector o-rings!! Read it on another forum, couldn't see fuel, smelt it on the D.Side, when the hood was open as well.

    Reply
    Flag This
  • Answer #2

    July 26, 2014, 20:12
     Rookie

    Check your fuel pressure regulator. It will leak at the seam intermittently. That should cure your problem.

    Reply
    Flag This